Electric fan



FIG. 1 is a perspective view showing the fan of an electric fan,

FIG. 2 is a top plan view,

FIG. 3 is a front view,

FIG. 4 is a rear view,

FIG. 5 is a right side view,

FIG. 6 is a left side view; and,

FIG. 7 is a bottom plan view.

The broken lines illustrate portions of the electric fan which form no part of the claimed design. 

The ornamental design for an electric fan, as shown and described. 